body {
   background-image: url(../images/background\(1\).png);
    background-size: 100%;
    background-repeat: no-repeat;
}

.container {
    width: 1800px;
    height: 1100px;
    margin: 100px auto;
    position: relative;
}

.row {
    display: flex;
    justify-content: space-between;
}

.item {
    opacity: 0.6;
}

.current {
    opacity: 1.0;
}

.btn {
    background: url(../images/choujiang.png) no-repeat;
    width: 300px;
    height: 100px;
    color: #fff;
    font-size: 40px;
    text-align: center;
    line-height: 90px;
    cursor: pointer;
    position: absolute;
    left: 50%;
    top: 63%;
    transform: translate(-45%, -35%);
    z-index: 10;
}

.images {
    width: 68px;
    height: 25px;
}